JPH036367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spring washer having a novel shape.

BACKGROUND TECHNOLOGY Conventionally, as a spring washer, (a) a ring made by cutting out a part and twisting it into a coil shape, and (b) a disc spring washer have been used.

Problems to be Solved by the Invention However, with the spring washer as in (a) above, (a) it is difficult to manufacture a spring washer with a large area due to its structure; Therefore, it is usually necessary to use it together with a general washer (a washer that is not a spring washer).

(b) When handling spring washers in the production process of a factory, generally the spring washer is fitted onto a screw or bolt blank (blank) and thread rolling is performed, and the outer diameter of the blank is The outer diameter of the screw is larger after rolling, which is often used to prevent the spring washer from falling off the screw or bolt, but this type of spring washer is coiled as described above. Since it has a twisted shape, the dimension in the axial direction (thickness direction) becomes large, so the length of the non-threaded portion of the screw or bolt into which this spring washer is fitted must be increased. Therefore, the threaded portion becomes shorter, which may lead to a decrease in the fastening strength of the thread.

In reality, as mentioned in the previous section, it is difficult to make this type of spring washer perform the function of a general washer. Since it is necessary to perform thread rolling processing with both a spring washer and a general washer fitted to the shape (blank) in advance, the non-threaded part of the screw or bolt must be made longer and the threaded part shorter. I don't get it.

There were other problems.

In addition, conventional disc spring washers have a front and back side, so when installing a disc spring washer on a screw or bolt, it is necessary to distinguish between the front and back, which greatly reduces work efficiency. There was a drawback.

Purpose of the Invention The present invention has been made to solve the above-mentioned conventional problems, and it is easy to provide a wide area and can also perform the function of a general washer. Thickness at the center) can be made thinner, and can be used when thread rolling is performed with a spring washer fitted to the original shape of the screw or bolt in order to prevent the spring washer from coming off the screw or bolt. Also, the length of the non-threaded part of the screw or bolt into which the spring washer is fitted can be shortened, there is no distinction between the front and back, and the screw or bolt can be tightened temporarily. The recessed part of an insert such as a terminal, which is provided with a U-shaped recessed part, can be easily inserted between the head and the screwed object, and after this insertion, the final screw or bolt It is an object of the present invention to provide a spring washer that can efficiently perform the installation work of the insert by performing proper tightening.

Means for Solving the Problems The spring washer according to the present invention has a roughly disc shape,
It has a hole in the center, and on the outer periphery of both sides,
A spring washer is provided with annular protrusions that protrude in the thickness direction, and has a symmetrical shape as a whole with respect to a center plane in the thickness direction, and the top part of the protrusion has a circular shape. It is located slightly inside the outermost periphery of the washer.

Effect In the present invention, since the annular protrusion is provided near the outer periphery, when the screw or nut is tightened, the spring washer uses the contact portion between the tightened object and the top of the protrusion as a fulcrum. Because it flexes, it exhibits spring properties and functions as a spring washer.

Embodiments Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a half-sectional view of an embodiment of a spring washer according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the vicinity of the outer periphery of the embodiment.
It is approximately disk-shaped, has a hole 20 in the center, and has slopes 11f and 11g on the outer periphery on one surface 11d side and the outer periphery on the other surface 11e side, respectively.
By providing this, the cross-sectional shape of the outer circumferential portion has a V-shaped point pointing outward in the radial direction. In addition, annular protrusions 19a and 19b are formed in the vicinity of the inner circumferential ends of the slopes 11f and 11g, respectively, protruding in the thickness direction. The inner peripheral side ends of the slopes 11f and 11g are formed with protrusions 19a and 19a.
9b (in the figure, lead lines 19a and 19b are drawn out from these tops). Therefore, each of these top portions forms a circle concentric with the hole 20 and is located slightly inside the outermost circumference of the washer 11'.

The spring washer 11' has a symmetrical shape as a whole with respect to the center plane in the thickness direction.

Since this spring washer 11' is provided with annular protrusions 19a and 19b near the outer periphery, when the screw (or nut) 21 is tightened, the tightened object Since the spring washer 11' is bent using the contact portion between the projection 19b or the top of the protrusion 19b or 19a as a fulcrum, it exhibits spring properties and functions as a spring washer.

Moreover, in this spring washer 11', structurally,
Since it is easy to have a large area, it can function not only as a spring washer but also as a general washer, so it can be used alone rather than in combination with a general washer as in the past. It also becomes possible.

In addition, since the thickness (particularly the thickness of the central part) can be made thinner, the spring washer 11' is fitted onto the original shape of the screw or bolt beforehand, and the thread rolling process is carried out. In order to prevent this spring washer 11' from falling off,
This spring washer 11' of the screw or bolt
The length of the non-threaded part into which the screw is fitted can be shortened. Therefore, the threaded portion of the screw or bolt can be made sufficiently long, and the tightening force of the screw or bolt can be sufficiently increased.

Furthermore, since this spring washer 11' has a symmetrical shape with respect to the center plane in the thickness direction, there is no distinction between the front and back, so there is no need to distinguish between the front and the back when attaching it to a screw or bolt. , work efficiency can be improved.

Furthermore, an insert such as a terminal (not shown) provided with a recess such as a U-shape is inserted between the head of the screw 21 (or bolt) and the object to be fastened 22 (threaded object). In this spring washer 11', the top of the protrusion is located slightly inside the outermost periphery of the washer 11', so when the screw 21 (or bolt) is temporarily tightened, ) can be easily inserted between the head of the insert and the object to be fastened 22, and by final tightening of the screw 21 (or bolt) after this insertion. , the installation work of the insert can be performed efficiently.

3 to 9 show an example of a method of manufacturing the spring washer 11'. To explain this, FIG. 3 shows a metal spring washer material 11 to be machined, and this material 11 has a flat annular shape with a hole 20 in the center like a normal washer, and its outer periphery. The surface 11h is a circumferential surface perpendicular to one surface 11d and the other surface 11e of the material 11. In this manufacturing method example, the outer periphery of such a material 11 is cut into a movable die 1 shown in FIGS. 4 to 9.
2 and a fixed die 14 are used to perform a type of plastic working.

The movable die 12 has a substantially rectangular parallelepiped shape and is movable along a predetermined linear path, and is reciprocated along the linear path by a drive device (not shown). A molding groove 13 having a V-shaped cross section is provided on one side surface 12a of the movable die 12 along the length direction of the die 12.

The fixed die 14 also has a substantially rectangular parallelepiped shape, and is fixedly installed parallel to or substantially parallel to the linear movement path of the movable die 12. However, the fixed die 14 is configured such that the angle of its fixed position can be adjusted around a rotating shaft 15 extending vertically through its center.
On one side 14a of the fixed die 14, a forming groove 16 also having a V-shaped cross section is provided.
This forming groove 16 is provided in the length direction of 4.
is opposed to the forming groove 13 of the movable die 12. As shown in FIG. 4, a material introduction groove 17 is provided on one end surface 14b of the fixed die 14 on the same plane as the forming groove 16.
is continuous with one end of the forming groove 16.

In this method, a material feeding device (not shown) moves the material 11 along the introduction groove 17 in the direction of arrow C in FIG. By moving the material 11 in the direction of arrow A in FIGS. 4 and 5 using the drive device, the material 11 is rolled between the dies while being sandwiched between the forming grooves 13 and 16 (FIGS. 6 and 7 are , the material 11 is the forming groove 1
3 and 16).

Then, the outer periphery of the material 11 is formed into the forming grooves 13, 1.
6, the forming groove 1 is formed as shown in FIG.
It undergoes plastic deformation according to the cross-sectional shape of 3 and 16,
The material 11 rotates at a certain number of revolutions, forming the forming grooves 13 and 16.
When the material 11 is discharged from the gap, the outer peripheral portion of the material 11 has a shape that completely corresponds to the cross-sectional shape of the forming grooves 13 and 16, as shown in FIG.

Further, at this time, a portion of the meat on the outer circumference of the material 11 escapes upward and downward in the figure, so that annular protrusions 19a and 19b are formed on the outer circumference.

As a result, a spring washer 11' having a shape as shown in FIGS. 1 and 2 can be obtained.

When the molding of one spring washer is completed as described above, the movable die 12 is moved by the driving device.
is pulled back in the direction of arrow B in FIGS. 4 and 5. Then, by moving the movable die 12 in the direction of arrow A again in synchronization with the timing when a new material 11 is fed from the material supply device, the outer peripheral portion of the material 11 can be formed in the same manner as described above. . Further, by repeating the same process thereafter, the outer peripheral portion of the material 11 can be successively formed into the shape shown in FIGS. 1 and 2.

In the above-mentioned example of the method for manufacturing a spring washer of the present invention, the molding grooves of the dies are linear and the material is rolled between the molding grooves of each die by moving the dies linearly. The material can be made circular, cylindrical, cylindrical, fan-shaped, etc., with forming grooves provided on the outer periphery of these dies, and by rotating at least one of these dies, the material can be rolled between the forming grooves of each die. good. When circular, cylindrical, or cylindrical dies are used, it is also possible to provide three or more dies and roll the material between these three or more dies.

Further, in the above embodiment, the cross-sectional shape of the outer circumference of the spring washer 11' is a V-shaped protrusion, but in the present invention, the top of the protrusion is located slightly inside the outermost circumference of the washer. If the cross-sectional shape of the outer periphery of the spring washer is designed to be as shown in FIG. It can be shaped as required.

Effects of the Invention As described above, the spring washer according to the present invention (i) has a structure that allows it to easily have a large area, so it can perform not only the function of a spring washer but also the function of a general washer; Therefore, it is not used in conjunction with a general washer as in the past.
It also becomes possible to use it alone.

(ii) Since the thickness (especially the thickness of the central part) can be reduced, thread rolling is performed with this spring washer fitted to the original shape of the screw or bolt in advance. In order to prevent the spring washer from falling off, the length of the non-threaded portion of the screw or bolt into which the spring washer is fitted can be shortened. As a result, the threaded portion of the screw or bolt can be made sufficiently long, and the tightening force of the screw or bolt can be sufficiently increased.

(iii) Since it has a symmetrical shape with respect to the center plane in the thickness direction, there is no distinction between the front and back, so there is no need to distinguish between the front and back when attaching it to a screw or bolt, improving work efficiency. be able to.

(iv) Since the top of the protrusion is located slightly inside the outermost periphery of the washer, when the screw or bolt is temporarily tightened, there is a U-shape between the head of the screw or bolt and the object to be screwed together. The recessed portion of an insert such as a terminal provided with a recessed portion such as a shape can be easily inserted, and after this insertion, the final tightening of the screw or bolt can be performed to attach the insert. You can work efficiently.

It is possible to obtain excellent effects such as.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing a spring washer according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing the vicinity of the outer periphery of the embodiment, and FIG. 3 is an example of the manufacturing method of the embodiment. 4 is a perspective view showing a die in the example of the manufacturing method, FIG. 5 is a plan view showing the example of the manufacturing method, and FIGS. 6 to 9 are moldings in the example of the manufacturing method. 10 is an explanatory diagram showing how the embodiment exhibits spring properties; FIG. 11 is a sectional view of main parts showing another embodiment of the spring washer of the present invention together with a die for processing the washer. It is a diagram. 11'...Spring washer, 19a, 19b...Protrusion, 20...Hole.

Claims (1)

[Scope of Claims] 1. It is approximately disk-shaped, has a hole in the center, and is provided with annular protrusions protruding in the thickness direction on the outer periphery of both sides, and has a thickness as a whole. 1. A spring washer having a symmetrical shape with respect to a center plane in the horizontal direction, characterized in that the top of the protrusion forms a circle and is located slightly inside the outermost periphery of the washer.